Perfect New Fish Tank Aquarium Media Filter 4 LBS Activated Active Carbon Charcoal with Nylon Mesh Bag Perfect New Fish Tank Aquarium Media Filter 4 LBS Activated Carbon Charcoal with Nylon Mesh Bag Perfect carbon filter bags, convenient for use with your canister filter, power filter, or pond filter Eliminates odors, colors, and organic wastes and keeps tank water crystal clear / Fast working and long-lasting Safe for both freshwater and saltwater tank Size of filter media bag: 8 " x 4.5